President's Open-Market Share Purchase — Insider Ownership Rises to 0.03% — Silicon Mitus

Summary

LX Semicon President Yuntae Lee acquired 1,500 common shares on the open market on July 30, 2026 at KRW 34,500 per share, bringing his total holding to 5,000 shares (0.03% of shares outstanding). The purchase is a routine insider-buying disclosure required under Korean capital markets law and does not involve any derivative or convertible instruments. While the transaction size is modest at approximately KRW 51.75 million (~USD 38,000), it represents a CEO voluntarily adding to his personal stake. Insider purchases at market price are generally viewed as a mild positive signal about management's confidence in the company's near-term outlook.

Historical Impact

5 past Insider Ownership Change · ≈ Form 4 events at Silicon Mitus

Median +5d

+1.18%

Range

-0.97% to +9.38%

Positive outcomes

4/5

Filed	P₀	P₊₅	+5d
Apr 22, 2026	₩56,500	₩61,800	+9.38%
Jan 8, 2026	₩50,800	₩51,400

Full Translation

Report on Ownership of Specific Securities by Officers and Major Shareholders Filing Version: 6.1 Company: LX Semicon Co., Ltd. Filing Date: July 30, 2026 Report on Ownership of Specific Securities by Officers and Major Shareholders To: Korea Financial Investment Commission To: Korea Exchange Obligation Trigger Date: July 30, 2026 Report Preparation Base Date: July 31, 2026 ※ The reporter confirms that the ownership status of specific securities as of the report preparation base date has been accurately described in accordance with relevant laws and reporting guidelines, and that there are no material false statements or omissions. Reporter: Lee Yuntae 1. Issuing Company Information Company Name: LX Semicon Co., Ltd. Entity Type: KOSPI-listed corporation Company Code: 108320 Total Issued Shares: 16,264,300 2. Reporter Information Report Type: Change Reporter Classification: Individual (Domestic) Name (Korean): 이윤태 Name (Chinese/English): 李潤泰 (Yuntae Lee) Date of Birth / Business Registration Number: 600719 Address (up to town/district): Daechi-dong, Gangnam-gu, Seoul Relationship to Issuing Company: Officer (Registered Director) Position: President Date Appointed: November 8, 2023 Date of Resignation: — Major Shareholder Status: — Contact for Business Inquiries: Affiliated Company: LX Semicon Co., Ltd. Department: Finance Team Title: Senior Manager Phone: 02-692-**** Name: Na Eunjin Fax: 02-6924-3114 Email: ******.na@lxsemicon.com 3. Ownership Status of Specific Securities a. Number and Ownership Ratio of Specific Securities Held Specific Securities | Common Shares No. of Shares | Ratio | No. of Shares | Ratio Previous Report (Nov 14, 2025): 3,500 | 0.02% | 3,500 | 0.02% This Report (Jul 30, 2026): 5,000 | 0.03% | 5,000 | 0.03% Change: +1,500 | +0.01% | +1,500 | +0.01% b. Breakdown of Specific Securities Held by Type Common shares: 5,000 (0.03%) Warrants, convertible bonds, bonds with warrants, profit-participating bonds, exchangeable bonds, depositary receipts, other: 0 Total: 5,000 (0.03%) Total issued shares (J): 16,264,300 Non-share specific securities: 0 Ownership ratio of all specific securities: 0.03% Ownership ratio of common shares only: 0.03% ※ Exchangeable bonds whose underlying assets are shares, and depositary receipts/derivative-linked securities whose underlying assets are shares, are excluded from the denominator when calculating the ownership ratio. c. Detailed Change Record Reason for Report | Change Date | Type | Shares Before | Change | Shares After | Price per Share (KRW) | Notes | Planned Trade Report Date Open-market purchase (+) | July 30, 2026 | Common share | 3,500 | +1,500 | 5,000 | 34,500 | — | — Total | — | — | 3,500 | +1,500 | 5,000 | 34,500 | — | — * For exchange-market trades, the settlement date of the contract is used as the change date. ** For non-share securities, the figure represents the exercise/conversion/exchange price, or the per-share price of shares acquired through exercise; amounts in parentheses represent the trading price of the security itself.